Automatic gas lock



R. MILLER.

AUTOMATIC GAS" LOCK.

APPLICATION FILED 0m. 1. 192;.

Patented June 13, 1922.

2 SHEETS-SHEET l.

a INVENTOR.

ATTORNEY.

. This invention relates warren s'rrss Parana" -rrics.

RUDOLPH MILLER, OF ST. MICHAEL, PENNSYLVANIA, ASSIGNOR 0F ONE-HALF TO LORENZ KLAGG, OF ST. MICHAEL, PENNSYLVANIA.

AUTOMATIC ens 1.001;.

Specification of Letters Patent. Patented June 13, 1922.

Application filed October 1, 1921. Serial No.'504,721.

State of Pennsylvania, have invented certain new and useful Improvements in Automatic Gas Locks, of which the following isa specification.

to the feed conductors of gas burners, and-has for one of its objects to provide asimply constructed attachment whereby the flow of gas is autoanatically cut ofi' in the event of the reduction of pressure belowa certain predetermined degree, or in event of the flow being interrupted from any cause, and danger of the restoration of the flow through an unlighted burner, thus prevented.

Another object of the invention is to provide a device of'this character which may be adapted to burner conductors of various forms and sizes without'material structural change in the burner or in the conductor.

With these-and other objects in view the .invention consistsincertain novel features of construction as hereinafter shown and described and then specifically polnted out in the claims, and in the drawings illustrative of the preferred embodiment of the inven tion Figure -l isa vertical sectional side elevation. I s

Fig. 2-is-a'vertical sectional elevation at right angles to Fig. 1.

Fig. 3 is a transverse section on the line 3-3 of Fig. 1.

Fig. 4 is a transverse section on the line 47-4: of Fig. 1. Fig. 5 is a side elevation with the covering .cap of the spring removed.

-Fig. 6 is a plan view of the parts shown in Fig. 5.

shell preferably formed in separable parts,

a "main hollow body portion 10 having a valve plug 11 mounted therethrough, the

plug having a gas passage 12 and provided with a spring, indicated at 13, operating to yieldably hold the plug in closed position or with its passage in engagement with an unperforated portion of the body as indicated in Figures 1 and 5.

The valve plug *11 is provided with a later- .ally directed combined stop and trip pin 14 which engages a shoulder 15 within the cas ing .10 when in one position, as shown in Figure 1, and adapted to trip a releasing mechanism when in another position, as hereafter explained.

The casing 10 is formed with a threaded extension 16 to receive the lower portion of the conductor for the flow of gas, a portion of the conductor being represented at 17.

At its upper side the casing 10 is extended to form a chamber 18.

Supported within the portion of the-chamber 18 next to the casing or shell 10, is an oblong supporting frame 20 in which two shafts 21 and 22 are mounted, while a third shaft .23 is supported by ears 24 rising from the frame 20.

Extending from the shaft 21 is an arm 25 having an off-set forming a stop shoulder 26 intermediate the ends with which the pin 14 engages when the plug 11 is turned into opening position, as hereafter explained.

Extended from the shaft 22 is a cam or stud'27 adapted to engage the lever arm 25 and elevate the same to release the shoulder and adapted to elevate the arm 28 into the .position shown by dotted lines in Figure 1,

when the shaft 23 is rotated.

.By this arrangement when the shaft 23 is rotated by applying the key device 30 thereto, the arm 28'is elevated and the cam lug 27 depressed and disposed in the position shown by dotted lines "in Figure 1, and-thereby 7 correspondingly depressing the arm 25 into the position shown by dotted lines in the same Figure 1.

Extending upwardly above the chamber member 18 is a tubular member32 having a threaded portion 33 at the upper end to receive the continuation of the service pipe represented at 34-. V

A portion of the interior of the member 33 is formed with longitudinally directed held in elevated position by the pressure of the upwardly flowing gas, and sufliciently heavy to fall by gravity and trip the member 28 in event of the reduction or stoppage of the flow of the gas. 7 v 7 When the gas is to be turned on, the key .30 is applied to the shaft 23 and the latter rotated one-fourth of a revolution to cause the crank member 31 to elevate the arm 29 and correspondingly depress the cam member 27 and dispose them into the position shown by dotted lines in Figure 1.

This action will release the arm 25 and permit its spring 25 to pull it downward into the position shown by dotted lines in Figure 1. with the shoulder 26 in the path of the pin 14', so that when the plug 11 is rotated to openlthe valve the pin will engage the portion of the arm 25 between the shaft 2 1 and the shoulder 26 and elevate the arm 25 and .pass the shoulder 26.when the arm will bereturned by its spring 25 to its lower. position, and thus lock the plug 11 from retrograde movement. The lateral pressure of the pin 14 under the influence of the spring 13 will be sufiicient to hold the arm 29 in its elevated position'so that the shaft 23 may be returned to its initial'positionas shown in full lines in Figure 1 with- "out releasing the arm 29, which remains poised as shown by dotted lines in the same figure; I

V The upward flow of the gas passes through the chamber 18 and extension 33 and around the floating member 37 and the weight ofthe member 37 is so gaged that the normal pressure of the gas will be sufficient'to maintain the float member in its upper position against the inturned portion of the casing 33, the flow of the gas not be ing interrupted by the float owing to the I presence of the spaced ribs 35, as will be obvious.

If the gas ceases to flow for any reason,

or if the pressure is .reduced below the normal, thefloat member will fall by gravity plug 11 until thepin lastrikes the shoulder 15, the valve being thus automatically closed and all danger of the flow of gas to an unlighted burner obviated.

By this means the free flow of the gas is not interfered with, while at the same time all danger of the flow of gas through an unlighted burner is effectually and automatically obviated. I 1 i The device is simple in construction, can be made of any required size to apply to gas conductors. of various sizes.

The preferred embodiment of the invention is disclosed in the drawings and set forth in the specification, but it will be understood that modifications within the scope'of the claimed invention may be made in the construction without departing from the principle of the invention or sacrificing any of its advantages.

Having thus described the invention what isclaimed as new is 1. A device of the class ing a valve including a rotative perforated plug having an outwardly directed st0p, a rock shaft carrying a lock lever having an intermediate stop shoulder to engage the described compris- Y plug stop to hold the plug inopen position,

another rock shaft carrying a trip means to release said lock lever, a floating member adapted to be maintained in elevated posltion by the normal gas pressure, and adapted to fall by gravity in event of the abnora valve including a rotative perforated plug,

'means for yieldably maintaining the'plug in closed position, a rock shaft carrying a lock lever adapted to holdsaidplug in openfposition against the resistance of the yieldable closing means, another rock shaft carrying atrip device operative to release. said ,locking means, and a floating member retained 1n. lnoperatlve position by the normalflpressure of the gas flowing through the plug and 7 adapted to depress said trip device and-re- 1 lease said locking means when the gas ceases to flow or when the pressure is reduced below the normal.

3. In a device of the class described, a

valve casing, a chamber communicating with thecasing, a perforated plug rotative in the casing, means for yieldably maintaining the plugin closed position, a frame within said chamber, a locking member'swingingly connected to said frame and operative to hold 7 said plug in open position against the resistance of said yieldable means, a trip device swingingly connected to said frame and opthe plug and adapted to depress said trip deerative to release said locking member, a vice and release said locking means when 10 guide casing communicating with said chamthe gas ceases to flow or when the pressure ber and having inwardly directed spacing is reduced below the normal.

ribs, a float member movable in said guide In testimony whereof, I afiix my signature casing and against said guide ribs and rehereto.

tained in inoperative position by the normal pressure of the gas flowing through I RUDOLPH MILLER. 

